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Building Up and Breaking Down

Rocks are broken down by physical changes in mechanicalfrostshorewaterSelect your answer weathering. One type of physical change is burrowwaterfrostrockSelect your answer action. This is when repeated freezing and thawing of weatheringfrostwatershoreSelect your answer breaks rocks apart. Water seeps into cracks, and as the temperature drops, it expandsfreezesrootsfrostSelect your answer. The ice freezesexpandsrootsfrostSelect your answer, widening the cracks. Then more water seeps in, repeating the process. Another physical change is the growth of plant rootswaterrockburrowSelect your answer in rock cracks. Moles, earthworms, and other animals that burrowrockwaterfrostSelect your answer turn over soil. As a result, these rocks are exposed to further frostshoreweatheringwaterSelect your answer processes. Moving water is another form of mechanical weathering. As water moves, it can transport pieces of broken watershorerockrootsSelect your answer . These rocks can be broken down into smaller rocks through rapids or crashes against the shorerockrootswaterSelect your answer.